Adsorption of Methyl Orange from an Aqueous Solution onto a BPPO-Based Anion Exchange Membrane

Abstract

In this research, the development of a novel brominated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO)-based homogeneous anion exchange membrane (AEM) via the solution casting method was reported. Fourier transform infrared spectroscopy was used to confirm the successful development of the BPPO-based AEM. The prepared AEM showed excellent thermal stability. It exhibited an ion exchange capacity of 2.66 mg/g, a water uptake ( W R ) of 68%, and a linear swelling ratio of 31%. Methyl orange (MO), an anionic dye, was used as a model pollutant to evaluate the ion exchange ability of the membrane. The adsorption capacity of MO increased with the increase in contact time, membrane dosage (adsorbent), temperature, and pH while declined with the increase in initial concentration of MO in an aqueous solution and molarity of NaCl. Adsorption isotherm study showed that adsorption of MO was fitted well to the Freundlich adsorption isotherm because the value of the correlation coefficient ( R 2 = 0.974) was close to unity. Adsorption kinetics study showed that adsorption of MO fitted well to the pseudo-second-order kinetic model. Adsorption thermodynamics evaluation represented that adsorption of MO was an endothermic (Δ H ° = 18.72 kJ/mol) and spontaneous process. The AEM presented a maximum adsorption capacity of 18 mg/g. Moreover, the regeneration of the prepared membrane confirmed its ability to be utilized for three consecutive cycles. The developed BPPO-based AEM was an outstanding candidate for adsorption of MO from an aqueous solution.

Adsorption of Eosin B from Wastewater onto the Prepared Porous Anion Exchange Membrane

“…It suggested that the porous AEM's capacity for adsorption was positively influenced by the EB starting concentration. 19,59 By adjusting the temperature from 273 to 333 K, the impact of temperature on the EB adsorption capacity was investigated. Figure 2d illustrates the impact of temperature on the EB adsorption capacity.…”

“…The porous AEM surface and EB molecules interacted more often. It suggested that the porous AEM’s capacity for adsorption was positively influenced by the EB starting concentration. , …”

“…The adsorption of EB on the developed porous AEM was conducted as described. ,,− To determine the ideal contact time, the small pieces of the developed porous AEM containing a measured mass (0.1 g) had been shaken for 50, 100, 200, 300, 400, 500, 900, 1200, and 1400 min in 40 mL of EB solution with a 50 mg/L starting concentration. Using its various masses of 0.02, 0.04, 0.06, 0.08, and 0.10 g in 40 mL of EB solution with an EB starting concentration of 50 mg/L for 1440 min, we discovered the optimal mass of the piece of porous AEM.…”

Adsorption of Methyl Orange Dye by Modified Fly Ash-Based Geopolymer – Characterization, Performance, Kinetics and Isotherm Studies

“…Adsorptions of MO dye by geopolymer and modified geopolymer with dose of 2 g.L -1 were performed in batch process at various pH (2,4,7,10,12), time (15,30,45,60,75,90, 105, 120 minutes), and initial concentration of MO dye solution (10,20,30,40,50,60,70,80,90, 100 mg•L -1 ) at room temperature and stirring rate of 200 rpm. The concentration of MO dye solution was analyzed using Thermo Scientific Genesys 10S UV-Vis spectrophotometer.…”

“…Meanwhile, in pseudosecond-order kinetics model, adsorption process is assumed to be controlled by chemical adsorption. As for Elovich kinetics model, adsorption process is assumed to be controlled by chemical adsorption on heterogeneous surface (Benjelloun et al, 2021;Khan et al, 2022;Nizam et al, 2021). Kinetics parameters for each kinetics model can be obtained by plotting linear equation ( 2) for pseudo-first-order model (ln(q e − q t ) versus t), plotting linear equation (3) for pseudo-second-order model (t/q t versus t), and plotting linear equation ( 4) for Elovich model (q t versus ln t) as shown in Figure 7.…”